
@charset "utf-8";

$width:100px;
@function fun($h){
	@return $h*10px;
}

@mixin op(){
	opacity: .5;
}

#box{
	width:$width;
	height:fun(10);
	a{
		font-size: 20px;
		&:hover{
			text-decoration: none;
		}
	}
	@include  op;
}